Beamforming handover messaging in a wireless network

Abstract

A first base station transmits a message to a second base station after a handover decision for a wireless device supporting beamforming and multiple carrier configurations. The message includes a plurality of measurement configuration parameters for the wireless device. The first base station receives a response from the second base stations. The first base station transmits a handover command to the wireless device subsequent to receiving the response message.

What is claimed is: 
     
       1. A method for use by a first base station, the method comprising:
 (A) one or more communication interfaces; 
 (B) one or more processors; and 
 (C) memory storing instructions that, when executed by said one or more processors, cause said first base station to:
 (i) transmit to a second base station and after making a handover decision for a wireless device, at least one first message comprising:
 (1) one or more parameters indicating said wireless device supports configuration of a maximum of k channel state information (CSI) processes for a carrier, k being an integer greater than one; and 
 (2) first configuration parameters of:
 (a) j CSI reference signals for said carrier, j being an integer smaller than or equal to k; and 
 (b) m CSI interference measurement resources for said carrier, m being an integer smaller than or equal to k; 
 
 
 (ii) receive from said second base station, at least one second message comprising second configuration parameters of:
 (1) p CSI reference signals, p being an integer smaller than or equal to k; and 
 (2) q CSI interference measurement resources, q being an integer smaller than or equal to k; and 
 
 (iii) transmit, to said wireless device and after receiving said at least one second message, a third message comprising said second configuration parameters of:
 (1) said p CSI reference signals; and 
 (2) said q CSI interference measurement resources. 
 
 
 
     
     
       2. The first base station of  claim 1 , wherein said instructions, when executed, further cause said first base station to:
 (a) encrypt said third message; and 
 (b) protect said third message by an integrity header. 
 
     
     
       3. The first base station of  claim 1 , wherein said third message:
 (a) further comprises configuration parameters of physical channels; and 
 (b) causes said wireless device to set up or modify at least one radio bearer. 
 
     
     
       4. The first base station of  claim 1 , wherein said third message comprises at least one of a physical layer parameter, a media access control layer parameter, and a radio link control layer parameter. 
     
     
       5. The first base station of  claim 1 , wherein said third message comprises uplink channel configuration parameters and handover parameters. 
     
     
       6. The first base station of  claim 1 , wherein said third message comprises at least one radio resource configuration parameter comprising at least one physical channel configuration parameter. 
     
     
       7. The first base station of  claim 1 , wherein second channel state information reference signals are transmitted by said second base station. 
     
     
       8. The first base station of  claim 1 , wherein second demodulation reference signals are transmitted by said second base station. 
     
     
       9. The first base station of  claim 1 , wherein said third message further comprises configuration parameters of a plurality of carriers. 
     
     
       10. A first base station comprising:
 (A) one or more communication interfaces; 
 (B) one or more processors; and 
 (C) memory storing instructions that, when executed by said one or more processors, cause said first base station to:
 (i) transmit to a second base station and after making a handover decision for a wireless device, at least one first message comprising at least one of:
 (1) one or more parameters indicating said wireless device supports configuration of a maximum of k channel state information (CSI) processes for a carrier, k being an integer greater than one; and 
 (2) first configuration parameters of:
 (a) j CSI reference signals for said carrier, j being an integer smaller than or equal to k; and 
 (b) m CSI interference measurement resources for said carrier, m being an integer smaller than or equal to k; 
 
 
 (ii) receive from said second base station, at least one second message comprising second configuration parameters of:
 (1) p CSI reference signals, p being an integer smaller than or equal to k; and 
 (2) q CSI interference measurement resources, q being an integer smaller than or equal to k; and 
 
 (iii) transmit, to said wireless device and after receiving said at least one second message, a third message comprising said second configuration parameters of:
 (1) said p CSI reference signals; and 
 (2) said q CSI interference measurement resources. 
 
 
 
     
     
       11. The first base station of  claim 10 , wherein said third message:
 (a) further comprises configuration parameters of physical channels; and 
 (b) causes said wireless device to set up or modify at least one radio bearer. 
 
     
     
       12. The first base station of  claim 10 , wherein said third message comprises at least one of a physical layer parameter, a media access control layer parameter, and a radio link control layer parameter. 
     
     
       13. The first base station of  claim 10 , wherein said third message comprises uplink channel configuration parameters and handover parameters. 
     
     
       14. The first base station of  claim 10 , wherein said third message comprises radio resource configuration parameters comprising one or more physical channel configuration parameters. 
     
     
       15. The first base station of  claim 10 , wherein said instructions, when executed, further cause said first base station to:
 (a) encrypt said third message; and 
 (b) protect said third message by an integrity header.